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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe68f8cb046c85fea3ad7e0432256efb6f634b0372190cb34abe505a5620e9c' 
  AND token = 'SEsfH8+pS8YsNN0BTsfzyIz8DRkkLBmdbAWL0S3yx8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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