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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1879139e8a594973429fc51c870c185e890fd7e2647e76a40ea737445d0be2e1' 
  AND token = 'bsyH82M2xdAAgbs3ln5GfpahwR17kzpmxG3PBT6G6ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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