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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbc613c01415b4bd266bb5fb87a404ffbfe0ad052fc60a214ad757e94c94372' 
  AND token = 'L6vAguRahiir8j/cTqVZrZkbhsQVFS/xNge6qyy5D7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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