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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642f35bb389d92f2822c99d675dd6008c7346123bcf2511977fb0145f230e6ff' 
  AND token = 'nwH/QZsiyFL9w2KmUZblEcJ8uQHwb7gk0z27YjcdTek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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