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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c570b2573227d60a65723a3cb0734b183de50af31cdbc8a96043fc9be47852' 
  AND token = 'Sm+BMk5XSe0hjjnVOzKtxIoQ6SRuBKKqOWjlyMaywtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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