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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b689a57a2a91ad482c1648cd0e7be9b67d315ba5f1f49e1fbe934dc731b04bcb' 
  AND token = 'hskIh0PZijKsjKi7E9UKlbe3H0zAYZHhahcfQAJIk4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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