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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e270f2767398f5cad3ba4bfaf2c50a27ee71e9c83d8ca8acea42ba2df5d70c3' 
  AND token = 'YGIGaLgJXzd1ktHW2SDA7y1nzV+A3VbdDIEIijmuCYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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