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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfb6ed9dd989d1e5deef2fd98c6ba6e083e9398cfe15f1a9ef06a6ff5022f27' 
  AND token = '5I4N4TsOkkWsCLpSU+ejC9kW4j2bQPju/VIH08htvgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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