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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa4dd35be46736efb27290296cc53c661024959cb5e7f23dc32b1e1f7ba53cb' 
  AND token = 'rNhAHTCtm3fpWXY0wjbnX1dDwvzQKRnpzv53H8QEaz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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