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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b5212d3cf574114fff574d5a6dba6a1b60bcb8ae04a356381cb7ad40bf6b72' 
  AND token = 'u8749fXCbaI0pfZiYHTngo/izS+Yf0Npjbs6sD2W9C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00267

JSON explain

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