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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2368da633e5adc5191aa10c95f1c3de6eeddbe74e3bed86559745639ca263fb7' 
  AND token = 'EeZWzHW/dj5rvrvaewC2l9bA3wef0/0K0ELLX1ajlaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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