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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993fc9879b3f1f336dd6df6e08dec6afc14cc3e9d1b2c75e8d3450af14a2d2f5' 
  AND token = 'smwXVhC8aNLjG8XvXe4OwqDrKI2AajepoDPsqi+NWdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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