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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95170a83b43ea8b568401a7dd62f280308377f8404fdb35b10579cccd9e3583b' 
  AND token = '7t3w2WSjNqQBHUS6vyvHzv3PjCJ8ZiVwRn1PAcsNTHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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