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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12594917a1f51360a526ef2644b3ef18e01fb54850eeb6a91cb17d3d5e8b040c' 
  AND token = '3+RgybYwPMJ8qRbwO17yZ+vh41XBqkWRm/uvJ68+ORk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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