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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63b92352c4493c75098259e2169c8b31bd4560e14cd0aabffb11c64c688eb75f' 
  AND token = 'uGee9kvLbjSR200UyjsaW8cnu2sBTrxJVFraVn8Z5U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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