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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe636ef007a738c631c6f4c39b1c0b072fbf1d7980df6ea65bb84b14e8aba1e' 
  AND token = 'clZRX6DqEQ8eBDgA6OxWKUX7B4YQt4xKP9zuK/EU6os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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