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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28718eb1dd4aaf583fcc196c296ddd1db80cf732a86ea0f09b4ec8f2fa0fdf2e' 
  AND token = 'IqzMuQHTCAW7op75l27cuojWwUs7BjPYk3unE9Ygbjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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