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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce36e6e1136d5589b2e1bd8ac1770ff7dde192af9216126f0d421428ab1075b' 
  AND token = 'XGVwnHdGXu0F1MmRL5/MynZjKsXwT0H7PT4ubVRiacE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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