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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1d40319b2670e380cc7b0fa92c523c8b570d6b5038df09918833e9b89f7e63' 
  AND token = '1R5J9JMNIYpi+TjtCOQhTdExPc9z5i7Dl7PQt+hL2dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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