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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee3cfdd8c72a858aff9ac61cfb9c516e33987e2144803f4b01d30fcd4b4218e' 
  AND token = 'g+TdeuB2htTAehKMGOj4K5aBXU/wSO2Mb3+Rcjp1d1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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