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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca2da78f1d22504a3f8fff5a95793369e987adddd4a7c911fa23baf4ad56750' 
  AND token = 'MTFQfjtTrmtiBHVmiUqtM6Sp+stz962qg+i/sDzuIQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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