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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2e20c8d695d5dc99c3210324df3faae6e093b7d30de5ff9082cf5a42cb0a26' 
  AND token = 'y1jOJuOo8jEpsRp8roBPNpifQH0xjXNyjPWq37CBKuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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