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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1977a8e915a2b7b13012b944172d59d5e0961e0a9bd0515f0ea1a4243b721dea' 
  AND token = '2zjhm/3i6Spi8jL2o8sBjaikH6enaSJt52YWATmjVrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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