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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ec9c6c62e4f7d18d4db9ba872d1407fc918311d80b59122f8ed6ca91ae3b14' 
  AND token = 'srKc8c9xVmsiwu6U3LuGhVm243DK6YP6VM9RSspc89Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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