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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41a1eaa3728423e9fb1e1e3d9069132b7a14c3ce6f746d4356a57078153d0984' 
  AND token = 'w6z4tRlSv2HFkwInvZtvNxJ70DITCLhC3gJK5qKCskA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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