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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35025c38a2633fa2eadf64860c0ebd13f28c8faee867660c369c9c32952ef6af' 
  AND token = 'Yw0as9IMXoqUPG64aw8RCrwQDrckDE5GUkqBqM5kkW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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