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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3090c6ef6d76a5e277e5f61c9c57b1267c0f2fc931a42ad6d689a3c7c9a290ad' 
  AND token = 'jNZgV7buKZ3tOd0MvjODAjhYqTrKu61sbGpfRVnrDSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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