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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da129d60bfab4887a57a8feb80d355eef1ab2f09c0dc27fd8568cbcf681dc843' 
  AND token = 'caiNuQ6ImwjNAaRIlIr4QgREYT8azqJk3/Udf1G7VN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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