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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80738f9b450e9fde5d92ddb6494dac4531d67ccf94f292ff24917345e3626cd' 
  AND token = 'laCSvVx3anVAmRyOk45gTCCb8xnxj2GRqr5ufPQHIWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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