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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c15365ff38c4150b5af0f363275bdb079b9546ef168fcf39130305315668c0d' 
  AND token = 'WWntcqjY5d8K4rDt35x84xldo40c0NkQIGBV1//AiC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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