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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77be3dca1b79ba3c569dcbe6e9e65f492413de9f027cf9c807ade4c8df1eeb09' 
  AND token = '7yZAWINB+8YTdOHX0IRt+SZL3iWZIblrG115YOPWHSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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