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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a47f5934e3b2de63d4fcef418286179e860506b56ce885f84fc38163e17ff13' 
  AND token = 'oAhPTC25WLtgWspp6kbQpdvTJQpWP9ZNeSry2cR4w/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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