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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169b06d8bb7767c915477ff7ffef8473cbcde478884344d0e54e2eaf28fb9923' 
  AND token = 'ofeAQKoGphPR7oUhpI9JUmQ5tDJ/cDXScIqJgf2YODY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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