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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f126007108ec7e159e36d9902e328c54d8b16ace3468960ed7d72c2b6398dd7f' 
  AND token = '/q9XUTpXDQTE454smyGSqzTZIps5f1pKbUdU4lIu3f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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