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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e637cac2e01b56fa60edd6951883a4d7853b1aabd79f7677f296eaff01cfce' 
  AND token = 'G/ISp9OTajxaQpCzT9utJMm2Uk6JQajMYUe4W+oWPTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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