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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f54bcfa040ee16caba1053f471ab26dbbda80b66a74c00974b87811f89ac24' 
  AND token = 'xnzcfSz4hp472rwnWeWtGz67UpZXt9IQn+veqSl3J/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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