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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddaccbdd489e6b71504c8b27d7ed113e4661100a7d2df46e0247850f868c5f0a' 
  AND token = 'AMSLxo5zit0xYqi/bLV6mmYDih5VH99XEabguikX09w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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