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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d8fbe386d39af07679b5fe6c4b8fb5f75967fc8a4b6edb42aded2a8e63d5ab' 
  AND token = 'PvQ2fbRQuAGUQaizLm28gZqar8+4kWJABF7Q23GyDUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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