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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8573ccf7fa3533e0ae967ad4b1c73b097cc8653fde2392ec826a3804c112a94b' 
  AND token = 'cXNVH1AH2LVJcTMj3iov8fYRiHbXpz/GJ8xt2FTedU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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