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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51733a204d7c0351684d5b4973ddad32084ae92ae9099f49942ac59dca80a41' 
  AND token = 'GDRcMJMhfxMj9FiOo0ChrV3tkdMwlfT+hD0eRePjSdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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