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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7832f7d6e80fd192a342cb198d67b2c0029ea332ff506853cf5332a6dc5cd94e' 
  AND token = 'KVi/jmut6fiLFsPXj5wLrUsQ4H51xn3nlB/gSOAp5E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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