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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b241db61ca96f7dbd7febb4673da87823f480369e73ba792d68ee34cba560bd7' 
  AND token = '36LuW0sGeU+cCRcP/VS6CHw8rSphRf7wus3ULgSyXsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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