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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b756c4a760d26e88afac5fc51e9af76c2f4a06a35454f0da4e8e68bad198422' 
  AND token = 'yvSvjyFD6VauTF3PhQlK8P38crC5zY8YcmOO1sCP/7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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