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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1717b55c994aa47a090dde72feda7a7b53d3dd4972cd821666c22f4d12e5a10a' 
  AND token = 'TGOy6GdkKfuBNvIYsR2B+r3MeSkgpz7+SXTbwn6rltQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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