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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e2c285744b7c23b2c0019b09f435730d23fb4100cf61ffdc3f3d2f76e51618b' 
  AND token = 'fds5VcgCpfZsxp89mWorAmizYzt6JQjYE2S9NtrFDok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00100

JSON explain

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