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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0b2b9ef04d0b955e4bf9403e83e2451dc1d98f6d6be880ee0e0c13e3deb7086' 
  AND token = 'XhUXWYIeKB0B6aWS4h2BHPKYqUyv/HU3CqXy3PiGKY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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