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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914a9a962465f31d38e20f964d4c84d25139999ecc1e5c3994ba112b8ce45244' 
  AND token = 'N3jJQPbOWb38pXUT/Io2MHfR5ITQMtJYhBVoOTgUVto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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