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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3063bafe76b12ed7f1d91b5241ac75d6c48d1768d5ae6c7dcbafc3e3f62c00b' 
  AND token = 'cMNBr/y1GX+HK5eabkRZzBhKaJBJTENfitFUdAUrc2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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