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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30d343624b45beb1a7c499d57c25f46dd685e5c13c670de3c6b6bbb65d44430' 
  AND token = 'hm9YdGYi3/lx9bm7Y/5CdjME/Qm9f/ndITy9Ocuy7l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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