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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd276c170bf650b8424b81ee45ff67b221a7ca9f29eea612ca5aaaff1472fc960' 
  AND token = 'vY/k3JH4/7ooAz7/RC4USXY3GuU9HauZGeSzQke4+W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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