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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3b6bee2338fd5a39ac2837c0256f987ec4e18f562c263a45903eec257ce8cb' 
  AND token = 'E39CfK2iWYvl8HCYgrlr9/srwEXJjsiLXv+WXl0F91E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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