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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d8096ba6be591f9f1335599231a3986bee1ad303c289ea7f8c56c5defd672d' 
  AND token = 'vsZJxhbbtGPxpZNFDWUjakm9lfkwYGoTYn723+HI0eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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