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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e8013431f1f4dca75c52e4079e6bf7850a232088aa86f89a34ae511f3df6e3b' 
  AND token = 'G6GN4Fd2EIBBa91xlrUHaASokZK/EtyJ70iL1Nx5VFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00137

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}