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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b631aa88c7e90f163d22e0595e749c9d050a16054f9698a63f7ec8e63e033a' 
  AND token = 'uYFDWP/qYSsTp5Z/iNy/V6ExREB11G6xT6pczY/+L74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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