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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dccb3dd3db8655095f5fe4fd80a7aaeedd94f10736c50f1f01af2afe3b06352' 
  AND token = 'cSScGauf3s/yEfJHC14x3GWSxwDeM3do7QLb1cm/MnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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