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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8409d1d183cf5f75486b8e631730fe36b0649c499c756b336c321cf33aa8be08' 
  AND token = 'O6q2p/rcEVuyQbdwIiFtueAR9CrzerCQCH3R5r0hEBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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