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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f00a3d2847d808ecc6a3afdb0ad85f14cb37e3819fd0d289a85bb7f7637ee9c' 
  AND token = 'JWIHfAq71nBsfYD4rfL9Hi7M4KmK1pHSqe4K7WC9moI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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