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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e182f130641fdb7bfb0f7bd9d9ca8492ac95be75d65a34c12451249e1406287d' 
  AND token = '98ogWj9BcdFjwtESUy9C/10mbUEUV3SdqLakFYk2A/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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