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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29b5aad93344e54f7eebb725b8deca43985984283e8976d077863ed104c4ea9' 
  AND token = '02jRc3wTZuSA93IUyy8NaR7VlBZAO7S87PAQxdcNYxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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