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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76941bc0c9e6c5cf16945cb04209a90696f39a9ce495c310e3733b56da09d11' 
  AND token = 'd2JGCNg9ocOwM9uzB8PuShJfLp3j/IuF5SM+se2MXRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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