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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e2f2c0ea0594a83979cb34453c604e5340ebce6b47df4c5aafe018f2d5affb' 
  AND token = '04W0HtpHueGQT3nP80p3XsUZ860y10cfF6aV4DR3b9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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