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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723befd4fa832cd1a1501234f8910a31d66d1524ec941ad20ae4c8cf59c7c14a' 
  AND token = 'XHw/jHsaxaKd6Z3gv2eHdOlrAWHQGPWhA765i1k4+9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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