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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031d3f2df276d986c1cc3bec77099c4c652ece16f43b18760624b577344fdf59' 
  AND token = '0oM+8tm/y2eoVwxtZ9AxEXlfyBQdzkn7af7p4bnsftw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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