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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885d2f297a960a0b8f4ce90cec88f7b55544c92b5e4df8831fd6f5939dac6278' 
  AND token = 'eirYc6IY4YmXLevcWzf2nGVU9D3xanb1pu61y66dGgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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